 For an equatorial GoTo telescope mount, the user must align the mount by hand with either the north celestial pole or the south celestial pole.Assuming the user is accurate in the alignment, the mount points the telescope to a bright star, asking the user to center it in the eyepiece.Since the star's correct right ascension and declination is already known, the distance from what the user considered to be the celestial pole and the actual pole can be roughly deduced.